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Semax

C
Animal replicated
C
Evidence grade: Animal replicated

Effect demonstrated in multiple animal studies; human data sparse or extrapolated. Grades summarize evidence quality, not whether a compound is appropriate, legal, or risk-free.

At a glance
What it is
Synthetic heptapeptide nootropic/neuroprotectant; ACTH(4-10) analog (MEHFPGP).
Why people use it
Acute Ischemic Stroke · Cognitive Enhancement · Optic Nerve Disease and Visual Function · Cognitive Rehabilitation Post-Stroke and TBI · Stress Resilience and Antidepressant-like Effects · ADHD-like Attention Support
What the evidence supports
Stroke: multiple Russian clinical trials (Gusev et al.), improved NIHSS/Barthel/Rankin vs placebo. 110-patient study: BDNF elevation correlated with rehab outcomes. Cognitive: n=11 (1996), n=24 fMRI (2018). All Russian, development institution provenance.
If you only read one thing

The central tension resolved: Semax is a stroke drug that biohackers have repurposed as a productivity tool. The stroke evidence involves multiple Russian clinical trials at 9,000-18,000 mcg/day showing improved neurological recovery on validated outcome scales — the kind of evidence that gets drugs approved.

Route / form

Same compound, route-specific context. Switch forms instead of opening separate pages.

Evidence fit
Established

the route used in Russian clinical trials. Olfactory pathway provides efficient CNS delivery. Accurate delivery technique is essential — same as Selank: head slightly ba…

Route caveat
Goal-dependent route

the form studied in all published clinical and preclinical research. Russian commercial formulations: 0.1% nasal drops (100 mcg per 0.1 mL drop) for cognitive and nootro…

Protocol anchor
Full dosing section

Open the full report at the dosing chapter for protocol rows, cycle context, and administration notes.

Typical dose snapshot
100 mcg
See route context
Standard Semax (MEHFPGP, ~815 Da)

the form studied in all published clinical and preclinical research. Russian commercial formulations: 0.1% nasal drops (100 mcg per 0.1 mL drop) for cognitive and nootropic use; 1% nasal drops (1,000 mcg per 0.1 mL drop) for clinical stroke protocols. The compound in all referenced trials. COA mass spec should confirm ~815 Da.

the route used in Russian clinical trials. Olfactory pathway provides efficient CNS delivery. Accurate delivery technique is essential — same as Selank: head slightly back, gentle sniff, olfactory mucosa target. Standard concentration: 0.1% for nootropic use (100 mcg per drop); 1% for clinical stroke protocols (1,000 mcg per drop). Community users work with 0.1% exclusively.

N-Acetyl Semax (~857 Da)N-Acetyl Semax Amidate
Published literature
3human RCTs3human studies6animal2in vitro
Evidence reality check
Human evidence
6 human studies
3 randomized; 3 observational.
Preclinical base
8 lab signals
6 animal; 2 in-vitro/mechanistic.
Evidence snapshot
Stroke: multiple Russian clinical trials (Gusev et al.), improved NIHSS/Barthel/Rankin vs placebo. 110-patient study: BDNF elevation correlated with rehab outcomes. Cognitive: n=11 (1996), n=24 fMRI (2018). All Russian, development institution provenance.
From the chapter quick-reference block.
Indication map
Supported / plausible / speculative / avoid
Plausible
Acute Ischemic Stroke · Cognitive Enhancement · Optic Nerve Disease and Visual Function · Cognitive Rehabilitation Post-Stroke and TBI · Stress Resilience and Antidepressant-like Effects · ADHD-like Attention Support
Stroke: multiple Russian clinical trials (Gusev et al.), improved NIHSS/Barthel/Rankin vs placebo. 110-patient study: BDNF elevation correlated with rehab outcomes. Cognitive: n=11 (1996), n=24 fMRI (2018). All Russian, development institution provenance.

Semax is the most clinically legitimate compound in the Western research peptide market and the clearest example of how the same molecule can have excellent evidence for one application and thin evidence for the application everyone actually uses it for. The stroke evidence is real. The nootropic evidence is a mechanistic argument plus community consensus. That distinction deserves to be stated plainly.

The central tension resolved: Semax is a stroke drug that biohackers have repurposed as a productivity tool. The stroke evidence involves multiple Russian clinical trials at 9,000-18,000 mcg/day showing improved neurological recovery on validated outcome scales — the kind of evidence that gets drugs approved. The nootropic evidence involves 11 healthy subjects in 1996 at 250-1,000 mcg/day and a compelling mechanistic story that the community has extensively validated by self-experimentation. Both are real. They are not the same quality of evidence. The community's choice to use Semax for nootropic purposes is defensible — the mechanism operates at lower doses, the safety profile is clean, and the community consensus is strong. It is not a choice supported by the same evidence that supports using it for stroke recovery.

The strongest argument for Semax: it is, by a significant margin, the most mechanistically well-characterized and most clinically validated neuropeptide available to the Western research community. The BDNF mechanism is independently replicated. The dopaminergic activation is documented. The anti-inflammatory cytokine modulation has human clinical data. It is on Russia's essential medicines list — the same category as insulin and aspirin by the logic of that designation. The community reports are among the most consistent in this reference. Whatever one believes about the nootropic dose gap, the biological legitimacy of the compound is well-established.

The strongest argument for caution: every clinical trial is Russian and from development institutions. The n=11 1996 study is the cornerstone of the nootropic evidence base. The forms question (standard vs NA-Semax vs NA-Semax Amidate) is unresolved by any comparative study. WADA coverage is uncertain. Sleep disruption at higher doses is real and consequential for the very users who care most about cognitive performance.

Properties
✓ Human RCTNot injectable
Molecular weight
~815 Da. CAS: 80714-61-0. Seven amino acids; Met-Glu-His-Phe core + Pro-Gly-Pro stability tail.
Half-life
Semax has a plasma half-life of approximately 20-30 minutes — longer than Selank's 2-5 minutes due to the Pro-Gly-Pro extension's greater resistance to peptidase degradation
Typical dose
Nootropic: 250-1,200 mcg/day intranasally, split AM/midday. N-Acetyl Semax: 30-40% lower dose, once daily. Stroke (Russian clinical): 9,000-18,000 mcg/day — clinical setting only.
Route
Intranasal — the route used in Russian clinical practice. NOT effective orally. SubQ injectable also used by community. Olfactory/nasal mucosa provides efficient CNS delivery. Late-day dosing disrupts sleep.
Evidence
CAnimal replicated
Origin
Developed at the Institute of Molecular Genetics, Russian Academy of Sciences, in the 1980s by the same team as Selank. Based on the ACTH(4-7) fragment with C-terminal Pro-Gly-Pro stabilizing extension.
Russian Status
On Russia's List of Vital and Essential Drugs (added 2011). Registered pharmaceutical for ischemic stroke, TIA, cognitive disorders, and optic nerve disease. Used clinically in Russian hospitals since the late 1990s.
The Dose Gap
Nootropic community dose: 600-1,200 mcg/day (0.1% solution). Russian stroke protocol: 9,000-18,000 mcg/day (1% solution). These are the same compound used for different indications at 15-30x different doses. The evidence quality differs accordingly.
Primary Mechanisms
BDNF + NGF upregulation (hippocampus, cortex); TrkB receptor activation; dopaminergic + serotonergic activation; anti-inflammatory cytokine modulation in ischemia (IL-10 up, IL-8/CRP down); possible enkephalinase inhibition.
BDNF Finding (Key Data)
Single intranasal dose (50 mcg/kg, rat): BDNF mRNA +3-fold, BDNF protein +1.4-fold, TrkB phosphorylation +1.6-fold in hippocampus (Dolotov et al., 2006, PMID 16996037). Independent replication.
FDA Status
Category 2 removed April 22, 2026. PCAC review July 24, 2026 for cerebral ischemia, migraine, and trigeminal neuralgia. These are the neurological indications — different from Selank's anxiety focus.
WADA
Not explicitly listed on 2026 Prohibited List. S0 coverage uncertain (same as Selank) — Russian approval may not satisfy S0 exemption criteria. Treat as potentially prohibited under S0. Verify before competition use.
Safety
Clean profile in published data. Primary concern: late-day dosing causes insomnia and sleep disruption — more common and more significant than with Selank. No dependence, no serious adverse events in clinical literature.
Simple view

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